Home on tosd - Theory of Small Decisions

An Ontology for the Semantic Layer

Wed, 02 Sep 2026 00:00:00 +0000

Semantic layers are usually sold as a place to put metric definitions. Write revenue once, expose it everywhere, stop arguing in meetings.

Then two teams report different revenue anyway, both technically correct, and the argument moves from the dashboard into the definition file.

The definitions were never the hard part.

Metrics are the visible layer, not the load-bearing one

A metric is an aggregation over a set of things. Change what counts as one of those things and the number changes, without the formula changing at all.

Batch or Real Time: A Tradeoff Usually Framed Wrong

Thu, 20 Aug 2026 00:00:00 +0000

The question arrives as a technology question. Should this integration be batch or streaming? And it gets answered like one, by comparing engines, latencies and throughput numbers.

That framing is the problem. Latency is not the requirement. It is a property you buy, and the thing worth arguing about is how much of it you actually need.

Start from the decision, not the pipeline

Data exists so somebody, or something, can act on it. So the useful question is not “how fresh can we make this?” but “how quickly does the action it triggers actually happen?”

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Mon, 27 Jan 2025 00:00:00 +0000

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